Ion Density and Temperature Measured by CINDI from the C/NOFS Spacecraft During a Slowly Rising Solar Cycle

Details Ion Density and Temperature Measured by CINDI from the C/NOFS Spacecraft During a Slowly Rising Solar Cycle Ion Density and Temperature Measured by CINDI from the C/NOFS Spacecraft During a Slowly Rising Solar Cycle

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1894c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1894

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2467] Ionosphere / Plasma Temperature And Density, [2479] Ionosphere / Solar Radiation And Cosmic Ray Effects

Scientific paper

The Ion Velocity Meter (IVM), a part of the CINDI instrument package on the C/NOFS spacecraft, has made over three years of in-situ measurements of plasma temperature, composition, density, and velocity in the 400-850 km altitude range of the equatorial ionosphere. The C/NOFS launch in April 2008 coincided with a period of unusually low solar activity with F10.7 cm radio fluxes consistently around 70 sfu. This resulted in a cold (~600 K in the pre-dawn region) low-density ionosphere near the spacecraft's 400 km perigee altitude and an unusually low O+/H+ transition height varying from 450 km at night to over 700 km during the day. Toward the end of 2009 solar activity began to slowly increase with F10.7 occasionally reaching 150 sfu. The variations of ion density, ion temperature, and the transition height are presented as a function of solar activity as well as their dependence on magnetic and geographic latitude, longitude, and altitude. Preliminary results indicate a relatively prompt response of ion density to F10.7 variations with a time scale of 1-3 days.

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